地理国情统计分析的服务内容和对象及领域探讨     

董春  刘纪平  程鹏飞  张玉  杜林丹 《测绘科学》2019,44(6):263-272,284

针对地理国情统计分析面临的深度应用、业务目标、快速响应等服务需求,该文提出了地理国情统计分析服务框架,并从服务的内容结构、对象模型、领域构成3个层面展开论述。地理国情服务内容涉及基本统计、综合统计和专题分析,将地理国情数据成果转化为统计信息和决策知识服务;地理国情服务对象涵盖了各级政府、专业领域和社会公众;地理国情统计分析成果在国家重大战略和重大工程、国土空间开发、资源环境审计、国土空间用途管制、生态环境保护等方面具有非常广泛的应用服务领域。  相似文献   

人工增雨作业条件预测方法研究   总被引：2，自引：1，他引：2  

袁野  李爱华  邵洋  周述学 《气象科技》2009,37(5):621-626

从国家级人工影响天气业务指导产品的卫星资料反演产品和模式产品中选择与安徽省自动雨量站1 h雨量和3 h雨量显著相关的产品作为因子,利用Fisher方法分别建立了安徽省各个季节各自动雨量站1 h和3 h的人工增雨作业条件二级判别方程,定量给出是否具备可作业条件的判断方法。回报试验表明,1 h作业条件判别方程的准确率可达到70%左右,3 h作业条件判别方程的判别准确率在50%以上,方程均有较好的预报准确率,可以用于人工增雨作业条件预测业务,但春秋季和夏季的空报率相对较高,需要在业务应用中引起注意。  相似文献   

Reconstruction of nearshore chemical conditions in the Mesoproterozoic: evidence from red and grey beds of the Yangzhuang formation,North China Craton     

Yu Zou  Dongna Liu  Hongwei Kuang  Changgui Song  Yuxiang Sun 《International Geology Review》2020,62(11):1433-1449

ABSTRACT

Mesoproterozoic red beds near ancient coasts have not aroused extensive interest. A new geochemical study of the alternating red and grey dolostones from the Yangzhuang Formation provides a better understanding of the redox conditions of nearshore sedimentary environments. In this contribution, whole-rock samples are characterized by positive correlations of rare earth elements (REE) vs. Th and Fe_T vs. Th and flat-type REE distribution patterns, indicating massive terrigenous input, which is considered to be inherited from felsic rocks. Relatively high (Fe_mag+Fe_ox)/Fe_T and Fe³⁺/Fe²⁺ ratios in red beds indicate more oxidized conditions in supratidal environments compared with the lower oxygen contents in intertidal environments. Under these two distinct chemical sedimentary conditions, acetic acid-leached red and grey samples both have HREE-depleted distributions, suggesting significant freshwater invasion. Moreover, limited terrigenous redox-sensitive elements (RSEs) can reach the coast where the red beds are deposited, whereas relatively high RSE enrichment factors originating from shallow oceans are recorded in grey beds. In the Mesoproterozoic, limited oxidative weathering, shallow seawater desalination, and low organic production occurred near the coast. Meanwhile, a prolonged period of low Mo and U availability preserved in carbonate minerals confirmed that marine oxygen levels failed to satisfy the deposition of offshore red beds. During the regression, potentially exposed sediments connected to atmospheric oxygen guaranteed the oxidation of iron and the formation of red beds, and these events were coupled with negative δ¹³C_carb shifts in the Yanliao rift zone.  相似文献   

Geochemistry of Sediments from the Lopare Basin (Bosnia and Herzegovina): Implications for Paleoclimate, Paleosalinity, Paleoredox and Provenance     

Aleksandra ?AJNOVI?  Nenad GRBA  Franz NEUBAUER  Milica KA?ANIN-GRUBIN  Ksenija STOJANOVI?  Nenad PETKOVI?  Branimir JOVAN?I?EVI? 《《地质学报》英文版》2020,94(5):1591-1618

A combined inorganic and organic geochemical study was carried out on marls and mudstones collected from the Lower Miocene Lopare Basin, Bosnia and Herzegovina. A total of 46 samples collected from two boreholes, Pot 1 (depth of 193 m) and Pot 3 (depth of 344 m), showed that element abundances like boron (B), lithium (Li), strontium (Sr), uranium (U), chromium (Cr), nickel (Ni), magnesium (Mg), sodium (Na) and calcium (Ca) are much higher than average than in the upper continental crust (UCC). Chemical composition indicates at least two sources: (i) Mesozoic ophiolites occurring in the north of the investigated area, and (ii) dacito-andesitic pyroclastics (Mesozoic to Cenozoic). Lopare Basin sedimentation was influenced by strong evaporation resulting in a partly hypersaline lake, which formed during a warm climatic period, probably during the Miocene Climatic Optimum. A brief episode of humid climate conditions resulted in the basin filling-up and deposition of felsic sediments enriched in thorium (Th). Organic geochemistry shows that the majority of studied sediments contains predominantly immature to marginally mature algal organic matter (OM). The biomarker patterns are generally in agreement with the geological history of the Lopare Basin and inorganic and mineralogical data. Conversely, the molecular distribution of n-alkanes as reliable climatic and δ-MTTC as paleosalinity indicators do not support this conclusion.  相似文献   

“地理国情监测”服务县域生态环境监测及动态分析     

何建宁  赵淮  王辉  张寅 《测绘与空间地理信息》2020,(1):103-108

走生态优先、绿色发展之路,是推动经济发展的基本要求。生态环境保护是我国当前及今后长期坚持的一项基本任务,已居于压倒性的战略地位。本文以多期地理国情监测数据为主要数据源,开展县域生态环境监测及动态评价,推进地理国情普查与监测成果的社会化应用。  相似文献   

基于产卵场海表温度的阿根廷滑柔鱼资源丰度预测模型研究   总被引：1，自引：0，他引：1  

王易帆  陈新军  郭立新 《海洋学报》2020,42(6):29-35

阿根廷滑柔鱼(Illex argentinus)为短生命周期种,其资源丰度易受海洋环境变化的影响,尤其是在产卵场的早期生活史阶段。根据2003?2016年我国鱿钓船队在西南大西洋的生产统计数据,以及产卵场海洋表面温度(SST)卫星遥感数据,用相关性分析方法筛选出阿根廷滑柔鱼产卵旺季期间(6月份)表征产卵场SST变化的特征海域;基于阿根廷滑柔鱼产卵场最适SST范围占总面积之比(Ps)与资源丰度单位捕捞努力渔获量(CPUE,t/船)呈正相关性的假设,回溯阿根廷滑柔鱼最适的产卵场及水温环境条件,并据此建立多种基于表征产卵场SST环境因子的资源丰度多元线性预测模型。相关性分析结果表明:6月份有两片连续海域(Area 1、Area 2)的SST与CPUE之间存在显著相关性,分别为42.5°～44°S、57.5°～59°W(Area 1)和39°～39.5°S、45°～46°W(Area 2);回溯的阿根廷滑柔鱼产卵场范围为37.5°～44°S、41.5°～51.5°W,产卵场最适SST范围为16～17.5℃。利用2个特征海域(Area 1、Area 2)SST以及回溯的产卵场Ps建立4种的多元线性资源丰度指数(ICPUE)预测模型,结果表明,包含表征寒暖流的特征海域和回溯产卵场Ps的方案4模型优于其他3种模型,其资源丰度指数预测模型为ICPUE=1.390 4×Ps+0.261 9×SST_{Area 1}+0.096 2×SST_{Area 2}?3.248 0。  相似文献   

基于机械学习理论的海冰风险短期预报研究          下载免费PDF全文

于嵩松  李思茵  张大勇  王刚  岳前进  李刚 《海洋技术学报》2020,39(1):32-38

海冰管理是抵御寒区海洋资源开发海冰威胁的有效手段,海冰风险的准确、快速预测是海冰管理系统的关键组成部分。文中面向海冰管理中的冰情短时预测需求,明确了基于现场监测的海冰风险预测模式,开展了应用机械学习理论的海冰风险短时预测方法研究,并以渤海辽东湾海冰管理为例,讨论了神经网络与小波分解等非线性预测方法在冰情短时预测中的适用性。结果表明,时间序列小波神经网络在短时(6 h)冰厚预测中的预测精度与Elman神经网络相仿,而在24~48 h预测中的精度偏差较大;Elman神经网络在6 h、24 h与48 h的冰厚预测中均能保持较好的预测精度,在冰流速与来冰方向预测中,模型预测精度达到80%左右。  相似文献   

人工培育条件下鲻鱼早期发育的生理生态研究     

区又君  李加儿 《热带海洋学报》1998,(4)

研究了在人工条件下,鲻鱼MugilcephalusLinnaeus幼体各部分形态、器官的发育时间、行为、营养和变态特点,划分了发育期。仔鱼在生长过程常因畸形、损伤和消化不良而死亡;生长差异则存在于整个发育期,并且差异随时间延长而增大。同时,对鲻鱼早期发育的生物学特点、疾病、变态危险期和生长差异等进行了讨论,指出鲻鱼与环境和饲育条件之间的生态生理关系,以及这种关系对鲻鱼生长和存活的影响。  相似文献   

中国海域及邻区主要含油气盆地与成藏地质条件   总被引：15，自引：4，他引：11  

蔡乾忠 《海洋地质与第四纪地质》1998,18(4):1-10

中国海域及邻区分布有近５０个沉积盆地,其中大部分发育在大陆边缘,而主要含油气盆地则分布在大陆架部位。盆地的起源,发生,发展受控于大地构造不同时期的构造运动,形成诸如裂谷型断陷盆地,走滑盆地以及非典型前陆盆地等多类型沉积盆地。从区域广度阐述了盆地沉积的有利相带对油气成藏的重要性,尤其是陆架盆地的成藏地质条件所形成的富集油气藏包括已发现的一大批大中型油气田,更具有的开发前景。  相似文献   

Numerical Simulation of Nonlinear Three Dimensional Waves in Water of Arbitrary Varying Topography   总被引：3，自引：0，他引：3  

HONG Guangwen  ZHANG Hongsheng  FENG Weibing Professor  Coastal  Ocean Engineering Research Institute  Hohai University 《中国海洋工程》1998,(4)

—The numerical simulation is based on the authors＇high-order models with a dissipative termfor nonlinear and dispersive wave in water of varying depth.Corresponding finite-difference equations andgeneral conditions for open and fixed natural boundaries with an arbitrary reflection coefficient and phaseshift are also given in this paper.The systematical tests of numerical simulation show that the theoreticalmodels,the finite-difference algorithms and the boundary conditions can give good calculation results forthe wave propagating in shallow and deep water with an arbitrary slope varying from gentle to steep.  相似文献